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Accessible ADU Design in Phoenix: How New Building Codes Support Aging-in-Place Casitas

Writer: Thomas Mulhern
Thomas Mulhern
Sep 10
2 min read

For many Phoenix families, the dream isn't just having a backyard casita, it's having one that works for everyone, including aging parents or family members with mobility needs. The City of Phoenix's adoption of updated building codes brings inclusive design standards that make this dream more attainable than ever.


Backyard mother-in-law suite with turquoise door
Backyard mother-in-law suite in Phoenix, Arizona built by AzADU

What the Updated Code Means for ADU Accessibility


The updated building codes reflect a broader commitment to smarter, more inclusive residential construction across Phoenix. For ADUs and backyard casitas, this translates into thoughtful considerations around:


  • Accessible entrances — level or gently ramped thresholds that eliminate tripping hazards for older adults and those using mobility aids

  • Wider hallways and doorways — designed to accommodate wheelchairs and walkers with ease

  • Bathroom fixture placement — grab bar-ready walls, roll-in shower considerations, and fixtures positioned for comfortable reach


These aren't just regulatory checkboxes. They're features that make a casita genuinely livable for a grandparent who wants independence without sacrificing closeness to family.


Why Backyard Casitas Are Ideal for Multigenerational Living


Arizona law allows up to two ADUs per single-family lot, giving Phoenix homeowners flexibility in how they house extended family. A detached casita sits privately in your backyard, close enough for peace of mind yet separate enough to preserve dignity and independence.


When built with inclusive design from the ground up, a casita offers:


  • No stairs or step-down entries to navigate

  • A full kitchen and bathroom designed for safer daily routines

  • Single-level living that adapts gracefully as needs change over time


This is aging-in-place done right. On your property, surrounded by family.


interior living room and kitchen view of a mother-in-law suite in Phoenix, Arizona
Mother-in-law suite interior living room and kitchen

How AzADU Builds Accessible, Beautiful Casitas


At AzADU, we understand that accessible doesn't mean institutional. Our pre-approved floor plans are designed with modern aesthetics and practical livability in mind, and we build every unit in full compliance with Phoenix's current building codes.


As a licensed General Contractor, we manage every phase of your project, from permitting through Certificate of Occupancy, so you never have to worry about code compliance or contractor coordination.


If your family is ready to create a safe, beautiful, and connected living space in your backyard, contact AzADU today to schedule a site visit and explore your options.

Have Questions? Let Us Get Back to You!

AZ-ADU-LOGO-SANDSTONE

AzADU

ROC License: ROC 351233

Address: 645 E Missouri Ave #250, Phoenix, AZ 85012

Phone: (602) 757-9294

For more information, please contact:

Tom Mulhern
AzADU Builders, LLC
Call me:  602-757-9294
or Email me: tom@az-adu.com

Notice to Property Owners: Per Arizona law, property owners have the right to file a written complaint with the Registrar for an alleged violation of A.R.S. § 32-1154, subsection A. Complaints must be made within the applicable time period set forth in A.R.S. § 32-1162, subsection A. For more information, visit roc.az.gov or call 602-542-1525.

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